import java.util.Arrays;
import java.util.HashSet;

public class Test2 {
    public static void main(String[] args) {
         String str = "a a" ;
         String[] strings = str.split(" ");
        HashSet<Integer> set = new HashSet<>();
        set.add(1) ;
        set.add(1);

        System.out.println(set.size());
    }
}
